Restore to user selected wallpaper after browser crash

chrome/browser/ui/views/ash/chrome_shell_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/ash/chrome_shell_delegate.h"
 
 #include "ash/launcher/launcher_types.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/wm/partial_screenshot_view.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/views/ash/app_list/app_list_view_delegate.h"
 #include "chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.h"
 #include "chrome/browser/ui/views/ash/status_area_host_aura.h"
 #include "chrome/browser/ui/views/ash/window_positioner.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/notification_service.h"
 #include "ui/aura/window.h"
 
 #if defined(OS_CHROMEOS)
 #include "base/chromeos/chromeos_version.h"
+#include "chrome/browser/chromeos/background/desktop_background_observer.h"
 #include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
 #include "chrome/browser/chromeos/dbus/power_manager_client.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/system/ash_system_tray_delegate.h"
 #endif
 namespace {
 
 // Returns a list of Aura windows from a BrowserList, using either a
 // const_iterator or const_reverse_iterator.
 template<typename IT>
@@ skipping 92 matching lines @@
 
 ash::SystemTrayDelegate* ChromeShellDelegate::CreateSystemTrayDelegate(
     ash::SystemTray* tray) {
 #if defined(OS_CHROMEOS)
   return chromeos::CreateSystemTrayDelegate(tray);
 #else
   return NULL;
 #endif
 }
 
+ash::UserWallpaperDelegate* ChromeShellDelegate::CreateUserWallpaperDelegate() {
+#if defined(OS_CHROMEOS)
+  return chromeos::CreateUserWallpaperDelegate();
+#else
+  return NULL;
+#endif
+}
+
 void ChromeShellDelegate::Observe(int type,
                                   const content::NotificationSource& source,
                                   const content::NotificationDetails& details) {
 #if defined(OS_CHROMEOS)
   switch (type) {
     case chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED:
       ash::Shell::GetInstance()->CreateLauncher();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;
   }
 #else
   // MSVC++ warns about switch statements without any cases.
   NOTREACHED() << "Unexpected notification " << type;
 #endif
 }